Jamison hits out at Carlton on marriage

The Blues released a statement on Wednesday declining to endorse the Yes Campaign on marriage equality, as Australians vote in a nation-wide postal survey on the matter.

In a short statement, the Blues declared themselves to be a "leader in engendering equality" but fell short of recommending a yes vote.

"The issue of 'same sex marriage' is essentially one of equality; and so the club encourages all of its people to have their say in this important national vote," it stated.

"As a club, we respect that this is about personal choice, and as such don't intend to campaign on the issue, but we do strongly reinforce our club's absolute commitment to equality - and a community that is free from any form of discrimination."

Jamison, who left the club at the end of last season after 150 matches, suggested it wasn't good enough.

"You can fence sit when you are debating whether to have a twilight grand final not when it comes to equality," he wrote on Twitter.

Carlton AFLW star Darcy Vescio has also been a prominent campaigner for same-sex marriage.

The AFL has made clear its support for marriage equality on Wednesday, replacing the AFL logo at head office with the word "Yes".

AFL clubs Western Bulldogs, North Melbourne and Collingwood have also pledged support for marriage equality in the past fortnight, joining long-term campaigners Sydney and St Kilda - who pioneered the annual pride game - on the issue.